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AF Switchgear Ltd
Considerations in the Specification of LV Switchboards
Cast Resin Transformer Ratings
(Click on image for larger view)
The above table should be used as a guide only. All calculations are
based on a secondary voltage of 417V no load, 400V on load.
Transformer currents and fault levels will differ for transformers
supplied at lower or higher secondary voltages.
Common Types of Form 4 Cabling Arrangements
Form 4 Type 6 (Illustration A)
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Busbar & device separation is achieved by
metallic or non-metallic rigid barriers or partitions
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LV Switchboard Cables are glanded on a common
gland plate & the cable inner cores are routed within a common
cabling chamber to the device terminals
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The terminals are extended from the device
into the common cabling chamber, the terminals are separated
from one another & are enclosed in their own compartment by
means of rigid barriers or partitions
Form 4 Type 2 (Illustration B)
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Busbar & device separation is achieved by
metallic or non-metallic rigid barriers or partitions
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Cables are glanded on a common gland plate &
the cable inner cores are routed within a common cabling
chamber, the cores then pass through a bushing arrangement into
the device compartment
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The cables are terminated within the same
compartment as the device, usually on the proprietary terminals
of the device
Form 4 Type 5 (Illustration C)
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Busbar & device separation is achieved by
metallic or non-metallic rigid barriers or partitions
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Cables are glanded on a common gland plate &
the cable inner cores are routed within a common cabling chamber
to the device terminals
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The terminals are extended from the device
into the common cabling chamber, the terminals are separated
from one another & are fully shrouded using insulated coverings,
e.g. PVC boots
Form 4 Type 7 (Illustration D)
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Busbar & device separation is achieved by
metallic or non-metallic rigid barriers or partitions
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Cables are glanded directly on individual
gland plates / gland boxes adjacent to the device
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The terminals are extended from the device &
are separated from one another by means of rigid barriers or
partitions. The terminals are enclosed in their own segregated
compartment / gland box
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Technical information associated with:
Considerations in the Specification of LV Switchboards
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A F Switchgear Limited
Nunn Brook Road
Sutton-in-Ashfield
Nottinghamshire
NG17 2HU
Tel: 01623 555 600
Fax: 01623 555 800
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